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July 2010 Geology and GSA Today highlights
Date:6/25/2010

dicator of changes in intensity of chemical weathering to explore the climatic changes during this time interval on the Yangtze block, south China. Their data show a high degree of chemical weathering of sediments, and a hot and humid climate under which the sediments were deposited in the Late Ordovician. This condition was followed by a sharp climatic overturn to an overall cold and arid climate. The temporal coincidence of two-phase massive biotic demises with the beginning and end of the cold climate epoch during the latest Ordovician, coeval with fluctuations in sea level and oceanic anoxicity, suggests that the large climatic changes could be one of the main triggering factors in the south China mass extinction.

Significantly warmer Arctic surface temperatures during the Pliocene indicated by multiple independent proxies
A.P. Ballantyne et al., Dept. of Geological Sciences, University of Colorado, Boulder, Colorado 80309, USA. Pages 603-606.

Arctic temperatures are currently increasing at an astounding rate primarily due to increased atmospheric CO2 levels; however, A.P. Ballantyne of the University of Colorado at Boulder and colleagues suggest that current CO2 levels may be sufficient to produce significantly warmer temperatures in the Arctic. They investigated Arctic climate during the Pliocene (2.6 to 5.3 million years ago), the most recent period in Earth's history when atmospheric CO2 levels were comparable to levels in today's atmosphere (about 400 parts per million). Their results indicate that temperatures on Ellesmere Island in the High Arctic during the Pliocene may have been considerably warmer than present-day temperatures. Based on three independent measures of past temperature from fossils, Ballantyne et al. estimated that the mean annual temperature of the Arctic during the Pliocene was approximately zero degrees Celsius. Although this does not seem that warm, it is ~19 degrees Celsius warmer than present-
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Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

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